Let's Go Diving! Petshop by Fringe Studio “Into The Deep” burrow toy set is made for pups with lots of energy that enjoy interactive puzzle toys. This burrow toy set includes 3 mini toys each with a with a loud squeaker and stuffed with fluff. Simply hide the mini toys inside the burrow structure, squeak the mini toy and watch your dog try to figure out how to pull them out. They'll really woof you for this brain teaser. Great for small dogs and not intended for aggressive chewers.